Damper.



N. PRUITT.

DAMPER. APPLICATION FILED APR. 17', 1908.

' Patented Sept 6,1910.

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UNITED STATES PATENT OFFICE.

NORMAN PRUITT, OF WASHINGTON, DISTRICT OF COLUMBIA.

DAMPER.

To all whom it may concern:

Be it known that I, NORMAN PRUITT, a citizen of the United States,residing at WVashington, in the District of Columbia, have invented acertain new and useful Damper, of which the following is aspecification, reference being had therein to the accompanying drawing.

This invention relates to dampers, the object in view being to improveand render more effective and economical the construction illustratedand described in Patent Number 885,915, granted to me November 13, 1906,the invention having in view the provision of means for regulating theamount of draft when the damper is in its closed position; also meansfor effecting and more thoroughly heating the fresh air intro duced tothe interior of the flue through the medium of the hollow damper.

Vith the above and other objects in view, the nature of which will morefully appear as the description proceeds, the invention consists in thenovel construction, combination and arrangement of parts as hereinaftermore fully described, illustrated and claimed.

In the accompanying drawings :Figure 1 is a vertical longitudinalsection of a flue section showing the damper arranged therein and themeans for providing additional draft when the damper is closed. Fig. 2is a view taken at right angles to Fig. 1, showing a sectional plan ofthe damper.

Referring to the drawings, 1 designates a flue section which constitutesthe casing or housing of the damper of this invention.

The damper shown at 2 is of the hollow construction described in myprevious patent referred to, and provided with hollow trunnions 3through which the air is admitted into the damper from the outside ofthe flue by means of the elbow and tee-connections 1 and 5,respectively, 6 designating a handle for turning the damper to a closedor open position or to an intermediate position as may be desired.

7 designates the stops or closures for the connections 1 and 5 when thedamper is moved to the position illustrated in Fig. 2. The damper isalso shown as provided with a segmental or half-moon shaped recess 8 inone end thereof which provides for a reduced draft even when the damperis en tirely closed, it being understood that when the damper is turnedfrom the vertical posi- Specification of Letters Patent.

Application filed April 17, 1908.

Serial No. 427,731.

tion shown in Figs. 1 and 2, which is the open position, said damper, byreason of its shape will form a closure for the fine with the exceptionof the segmental or half-moon shaped recess 8 which provides for amaterially reduced and sufficient draft.

In carrying out the present invention, to provide for greater draft andthereby enable the user of the device to satisfactorily regulate thedraft when the damper is closed, I provide the main flue casing orhousing 1 with a hollow offset 9 which may be formed separately from theflue, if desired, and provided with flanges 10 by which it is attachedto the main flue v1 as illustrated in Fig. 1. Within the hollowextension 9 is arranged an additional auxiliary damper 11, the shaft 12of which extends outward through an opening in the oflset 9 where it isprovided with a suitable operating handle 13'. The shape of theauxiliary damper 11 may be varied as well as the shape of the hollowoffset 9 and it will also be apparent that the capacity of said hollowoflset and auxiliary damper may be widely varied. Furthermore, themanner of mounting the auxiliary damper 11 within the offset may bechanged, the main feature of the invention being that the casing l isprovided with a hollow oflset which registers substantially with thehalfmoon shaped recess 8 of the hollow damper when the damper is closed,which hollow offset is controlled by an auxiliary damper whereby theminor draft in the flue when the damper is closed may be regulated.

At the end of the damper opposite the recess 8, said damper is providedwith exit perforations 13 for the escape of the heated air from thehollow damper. In order to effectively heat the air which is receivedthrough the trunnions 8, the damper is provided internally with U-shapedbaffle walls 14 and other baffle walls 15 which lie between the oppositeportions of the baffle walls 1 1 thereby forming tortuous or S-shapedpassages which act to deflect or conduct the iii-coming air back andforth lengthwise of the damper a plurality of times so that before theair traverses the final passage 16 between the two sides or baffles, itis thoroughly heated and escapes in such heated condition through theexit openings 13. It will be seen that when the air enters the hollowtrunnions 3 it passes first toward that end of the damper in which thehalfmoon shaped recess 8 occurs. The air is Patented. Sept. 6, 1910.

then deflected and carried toward the opposite end of the damper. It isthen again deflected and carried back in the same direction as at firstand finally the air is centralized and forced to pass through thecentral passage 16 toward the end of the damper where the openings 13occur, the air escaping through said openings into the flue and greatlyaiding combustion by supplying heated oxygen above the bed of coals.

17 designates a rest for the lower end of the damper when in a verticalor open posi tion.

I claim 1. The combination of a pivoted damper, and a flue controlled bysaid damper and provided with a hollow outward extension having itsinner side open and in line with the edge of the damper when closed saidextension being located above the axis of the damper and constituting abypass directly around the free edge of the damper when closed.

2. The combination with a flue having a hollow offset, of a handoperated damper controlling the main body of the flue and provided witha recess in its edge which in connection with the offset in the fluewall forms a draft opening around the free edge of the damper whenclosed, and means independent of the said damper for regulating the sizeof said shaft opening.

3. The combination with a main damper of a flue having a hollow outwardextension having the inner side thereof open and forming a by-passdirectly around the edge of the damper when closed, and an auxiliaryhand-operated damper operable independently of the main damper andcontrolling such by-pass.

In testimony whereof I aflix my signature in presence of two witnesses.

NORMAN PRUITT. lVitnesses T. LLOYD MooKABEE, E. O. CROCKER.

